function uniform_date(evt,code_touche)
	{
		
		/*if(evt.value.length==2 || evt.value.length==5)
		     evt.value+="/";	
		*/
		if(code_touche!=8)
		{	
			if(evt.value.length==2 && evt.value.indexOf("/")==-1)
				evt.value+="/";
			if (evt.value.length==5 && evt.value.indexOf("/")==2)
				evt.value+="/";
		}
	
	}
	
	function validate(data)
	{
		if(data!="")
		{	
			
			var nom_case;
			
			err = 0;
		
			if((data.charAt(2)!="/" && data.charAt(5)!="/") || data.length!=10)
				err = 1;
			else if(isNaN(data.charAt(0))||isNaN(data.charAt(1))||isNaN(data.charAt(3))||isNaN(data.charAt(4))||isNaN(data.charAt(6))||isNaN(data.charAt(7))||isNaN(data.charAt(8))||isNaN(data.charAt(9)))
				err = 1;
			else
			{
				day = eval(data.charAt(0)+data.charAt(1));
				day = parseInt(day);
				mnth = eval(data.charAt(3)+data.charAt(4));
				mnth = parseInt(mnth);
				yr = eval(data.charAt(6)+data.charAt(7)+data.charAt(8)+data.charAt(9));
				yr = parseInt(yr);
			
				if(mnth>12 || mnth<1)
					err = 2;
		       
		        	// mnthArray[0] is january, mnthArray[11] is december
		 		mnthArray = new Array(31,28,31,30,31,30,31,31,30,31,30,31);
		
				if( yr%4==0 && mnth==2)
		                	mnthArray[1] = 29;
		
				// netscape/IE number months starting with january = 0
		 		mnth = mnth-1;
				mydate = new Date(yr,mnth,day);
		
				if(day > parseInt(mnthArray[parseInt(mnth)]))
					err = 3;
			}
		
			switch(err)
			{
				case 1: alert("La date doit être au format dd/mm/yyyy.");
					return false;
					break;
				case 2: alert("Le mois entré est invalide.");
					return false;
					break;
				case 3: alert("Le jour entré est invalide pour ce mois.");
					return false;
					break;
				case 4: alert("The date you entered does not occur on a Friday.");
					return false;
					break;
				default: return true;
			}
		}<!-- if(data!="")-->
		else
		{	
			alert('Veuillez saisir une date de début, svp !!!')
			return false;
		}
	}
	
	function validate_fin(data)
	{
		bool =false;
		if(data.length==0)
			bool=true;
		else
			bool = validate(data);					
		return bool;
	}